Synthesis and multi-color tunable luminescence performance of Tb3+/Eu3+ co-doped SrGdGa3O7 phosphors

Some Tb 3+ /Eu 3+ doped SrGdGa 3 O 7 (SGGO) phosphors were fabricated, achieving multi-color tunability through the addition of a sensitizer. The experimental results indicate that the doped ions are uniformly distributed, with no impurity phases detected. In SGGO-based phosphors, Eu 3+ ions serve as activators and exhibit an optimal luminescence transition level of 5 D 0  →  7 F 4 . When Tb 3+ ions are used as the sensitizer and at a specific concentration, the luminescence color transition of green → orange → red as the content of Eu 3+ enhances. Analysis of the decay lifetime curves reveals that Tb 3+  → Eu 3+ energy transfers occur in the co-doped SGGO phosphors, with the mechanism identified as quadrupole–quadrupole interaction. This article investigates the specific energy transfer processes involved. The optimum content of Eu 3+ is ascertained as 0.03. Under the excitation at 375 nm, the SGGO based phosphor containing 0.06 Tb 3+ and 0.03 Eu 3+ exhibits CIE coordinates of (0.5000, 0.4397).